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Originally Posted by KiwiJochen
A mono nav cannot display anything on a colour screen
A colour nav cannot display anything on a mono screen
If you have changed the nav from mono to colour, then you need to fit the nav into a car with a colour screen
Using NavCoder you can see if the nav is still "alive" by talking to it (reading nav config, etc)
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if I insert back the v25 mono software the power light comes back on and display works again, which means my mk3 did not die. Question is if after upgrade to mk3 colour, power light turns off and display as well.. means it has been upgraded? I can do this back and forth.. thanks.